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Ｘ射线计算机体层摄影装置（ＣＴ）在我国的应用日益普及。据１９９８年１０月进行的不完全统计，我国已投入运行的ＣＴ机达３５００余台，而且以每年约３００台的速度增加。与欧美等经济发达国家不同，我国ＣＴ机配置种类繁多，更新速度较慢，新式的螺旋ＣＴ在大中型医院竞相
The application of X-ray computed tomography (CT) device in our country is getting more and more popular. According to incomplete statistics conducted in October 1998, the number of CT machines in operation in our country has reached 3,500 and has been increasing at an annual rate of about 300. Different from other economically developed countries such as Europe and the United States, the configuration of CT machines in our country is various and the update speed is slow. The new type of spiral CT competes in large and medium-sized hospitals